Four children made the following statements.
Amelia : The average of Scarlett's mass and my mass is 35 kg.
Mia : I am the heaviest.
Scarlett : Emma is 2 kg lighter than Mia.
Emma : Our masses are in consecutive order.

What is the total mass of Amelia, Mia and Scarlett ?
Order of the mass of 4 children:
_____ , Emma, _____ , Mia (Heaviest)

Total mass of Amelia and Scarlett 
= 2 x 35
= 70 kg

For Amelia and Scarlett,
Mass of the lighter one = 1 u
Mass of the heavier one = 1 u + 2

Total mass of Amelia and Scarlett
= 1 u + 1 u + 2
= 2 u + 2

2 u + 2 = 70 
2 u = 70 - 2
2 u = 68

1 u = 68 ÷ 2 = 34

The mass of the four children in consecutive order is 34, 35, 36 and 37.

Total mass of Amelia, Mia and Scarlett
= 34 + 36 + 37
= 107

Answer(s): 107 kg